More often than not, the tune C is NOT of low enough Xc to be irrelevant.
Dick
-----Original Message-----
From: Jon Ogden [SMTP:jono@enteract.com]
Sent: Wednesday, March 17, 1999 9:32 AM
To: amps@contesting.com
Subject: Re: [AMPS] Chokes and Dipping chokes?
>>A Can you explain why the no-strap method would miss a potentially
>>problematic resonance?
>
>Yes I can.
>
>Will you explain how an unshorted choke will show series resonances?
In the tank circuit, the choke IS shorted in terms of RF. Rich is correct.
At one end of the choke, you have the HV bypass caps. At the other end,
you go thru your DC blocking cap and the Tune C. Tune C is connected to
ground.
SO, it IS a short circuit meaning that both sides of the choke have a path
to ground.
I did an experiment the other night measuring the dip of a choke in circuit
while doing it Rich's way AND also shorting the choke directly. Very
little difference in the series resonance of the choke. Both methods
provided a dip w/in a few 100 KHz of each other.
73,
Jon
KE9NA
--------------------------------------------------------------------------
Jon Ogden
jono@enteract.com
www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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